package lab04.day20171221;

import java.io.*;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Test04 {
    public static void main(String[] args) throws IOException {

        Map<String,Integer> map=new HashMap<>();
        //字符流的方式读文件
        BufferedReader reader=null;
        try {
            reader=new BufferedReader(new FileReader("D:" +
                    "\\key.txt" ));
            String stuNO=null;
            while ((stuNO=reader.readLine()) != null){
                map.put(stuNO,0);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            reader.close();

        }
        //得到某一个文件夹下面的所有文件
        File file=new File("D:\\16信本2班Java作业一");
        File[] files=file.listFiles();
        //遍历
        for (File f:files){
            String fileName =f.getName();
            String no=null;
            Matcher matcher= Pattern.compile("信本2班(\\d+)").matcher
                    (fileName);
            while (matcher.find()){
                no =matcher.group(1);
            }
            map.put(no,1);
        }
        //打印所有value为0，就是没有交作业的同学
        for (Map.Entry<String,Integer> entry:map.entrySet()){
            if(entry.getValue() ==0){
                System.out.println(entry.getKey());
            }
        }


    }
}
